Interviewing lot's of people to understand their view points and not to have conversations with them to show them where they are wrong but be non-judgemental. That's basically what YC teaches.
Reasoning by analogy is useful in some cases.
There's a huge class of expert decisions that's done via intuition.
Using a technique like Gendlin's Focusing would be a way to get to solutions that's not based on logic.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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